Stocks Show Limits of Money Printing

The limits of the power of central-bank money printing are becoming painfully apparent in the stock market.

About a half-trillion dollars of value was erased from the U.S. stock market over the past three trading sessions, including Tuesday's 1.3% drop in the Dow Jones U.S. Total Stock Market Index, a far more comprehensive measure than the familiar Dow Jones Industrial Average of 30 large-capitalization stocks, which slid 1.8%, or...